Sherlocked In: The Detective's Point of No Return

By David Griffin Brown

Every protagonist eventually reaches a point in the story when turning back becomes impossible. Sometimes that threshold is physical, like when Alice tumbles down a rabbit hole. Sometimes it's personal: the stakes are so emotionally significant that they can’t conceive of abandoning their quest. Either way, the function is the same. A point of no return locks the protagonist onto a path they can no longer abandon.

For most protagonists, this beat is momentous. It's the point in the story where the protagonist fully commits to whatever lies ahead and thus marks the end of act one and the beginning of act two.

For detectives, however, the standard version of this beat doesn’t quite work. Solving crimes is the job. A detective walking into a crime scene isn't really crossing a threshold. It's just another Tuesday.

Another Day, Another Body

Not every case a detective works on is going to be interesting enough to fill a novel, even when a murder is involved. Real investigations are full of paperwork, dead ends, and cases that resolve themselves without any drama at all. None of that makes for a bestseller. We need the highlight cases, the ones where the particulars of a crime sink their teeth into the detective and refuse to let go.

That is what the point of no return has to accomplish in a mystery. It can't just get the detective moving, since the detective was already moving. It can’t just be another client walking through their door, because the day-to-day is too mundane. The point of no return needs to establish why this case is the one that simply must be solved.

Case Accepted vs. Case Committed

Across the many skeletons we've analyzed, this stage of a mystery tends to be split into two parts. The first is what we call case accepted: the detective agrees to take the job. The second, the actual point of no return, follows on its heels. It’s the moment the case takes on a personal significance, such that they need to follow it to its conclusion. A murder investigation comes with stakes of its own, but for a detective who wades through bodies by the dozens, some murders will be more compelling, or intriguing, or they’ll have skin in the game in some form.

For example, Holmes only takes cases he finds intellectually stimulating. Many he dismisses outright for being too dull or obvious. Others he looks into tentatively, hopeful there will be a novel element that grabs his attention. Dresden, on the other hand, will take on almost any case because he has rent to pay. In Storm Front,  Dresden’s case-accepted beat is nothing more than a retainer changing hands. That's exactly why his point of no return, which comes in the form of threats from a mob boss, is so important. Without it, the story wouldn’t kick off with the same amount of urgency.

That’s not to say this is set in stone. Sometimes, like with Atticus Pund in Magpie Murders or Kinsey Millhone in A is for Alibi, they reject the case at first, essentially “refusing the call.” In these examples, case accepted coincides with the point of no return.

(Murder) Case in Point

Here's how the beat plays out in some of the mysteries we've studied.

Arthur Conan Doyle, The Hound of the Baskervilles

Holmes agrees to help Dr. Mortimer, but his acceptance comes more as a result of curiosity than commitment. The actual threshold arrives when, upon setting out with Watson for a preliminary poke around, a bearded stranger follows them in a carriage, and he sees Holmes before Holmes realizes they’re being followed. Right away, he knows he is up against someone cunning. Instant professional respect. Now Holmes needs to see this case through—to answer the challenge.

Edgar Allan Poe, The Murders in the Rue Morgue

Dupin's interest in the killings starts out somewhat academic, like a case he'd find satisfying to solve for its own sake. But it becomes personal the moment Adolphe Le Bon, a man Dupin knows and feels indebted to, is arrested for the crime. This is a great example of how a point of no return can pin a case to an existing relationship. Dupin isn't just curious about an impossible crime anymore. He owes Le Bon something, and solving the case becomes a chance to repay that debt.

Agatha Christie, Murder on the Orient Express

Poirot's acceptance of the case isn’t in question, since Bouc is a friend and a murder aboard a stalled train is exactly the kind of situation Poirot can't resist. It’s still just another case. But the stakes rise once Poirot discovers the victim’s true identity, the man responsible for a child's kidnapping and death years earlier—a crime that dominated headlines in America for some time. Poirot is a bit of an egotist, and this point of no return stokes his ego. It’s a case with international importance and a victim many people will be happy to have dead.

Anthony Horowitz, Magpie Murders

At first, Susan Ryeland has a hunch there is something fishy about Alan Conway's apparent suicide. This hunch is a technical starting point for her investigation. She’s not a detective, so it’s not really a case-accepted beat. It’s more of a traditional catalyst. She crosses the actual threshold once she rereads his suicide note and realizes it doesn’t say anything about killing himself. Her suspicion becomes certainty: the most successful mystery author of his generation was himself murdered.

Raymond Chandler, The Big Sleep

Marlowe's initial assignment, dealing with a blackmailer targeting Carmen Sternwood, is technically complete the moment Geiger turns up dead. But Chandler doesn't let Marlowe (or us) off that easily. He finds Carmen at the scene, drugged and naked, and a missing reel of film promises the blackmail is just getting started. Thus the stakes reset, since now there's a corpse attached and a vulnerable client still in danger. Most importantly, Marlowe's code won't let him walk away from a damsel in distress.

Patricia Cornwell, Postmortem

Scarpetta's investigation into a serial killer is already serious business, but her point of no return is the threat to her own career. When she's accused of leaking details to the press, her job and her professional reputation are suddenly on the line. This is a good example of a point of no return that raises the stakes by attacking the detective directly rather than escalating the case. Solving the murders was already important. Now, solving the case is bound up in Scarpetta defending herself as a woman in a role many colleagues think she shouldn't hold.

Umberto Eco, The Name of the Rose

William's case begins with a single death that could plausibly be a suicide or an accident. But once a second body turns up, murder is the only credible explanation. For a character defined by rational inquiry, this point of no return fits perfectly. It’s an unresolved pattern that he can’t resist seeing through to its end.

Raise the Stakes, Hook the Reader

A point of no return in a mystery novel can vary quite a bit from detective to detective. Sometimes it provides an extra layer of intellectual excitement. Sometimes it incorporates a personal threat. Sometimes it ropes in an important relationship. What will work best for your novel really depends on who your detective is. But what doesn’t vary throughout these examples is the function of this beat. This isn’t just about plot mechanics or paint-by-numbers storytelling. The point of no return makes the detective care more about solving the case, which in turn increases the reader’s commitment.

When a detective is only working a case for the paycheck, our emotional draw starts out pretty low. Not that this can’t be pulled off. Anything can be done well. But you generally don’t want your readers starting out only mildly curious. The moment a case becomes personal for the detective, our attention sharpens along with theirs. We start cheering them on rather than merely observing.

So ask yourself: what does your detective stand to lose if they walk away from this particular case? If you can’t come up with a clear, specific, and compelling answer beyond a paycheck, then you might need to look more closely at your point of no return.

David Griffin Brown is an award-winning short fiction writer and co-author of Immersion and Emotion: The Two Pillars of Storytelling, Story Skeleton: The Classics, and Fake Query Letters by Dead Authors. He holds a BA in anthropology from UVic and an MFA in creative writing from UBC, and his work has appeared in literary magazines such as the Malahat Review, White Wall Review, and Grain. He has published three novels: When the Sky Breaks, We've Come for Your Eggs, and No Country for Old Dragons. David founded Darling Axe Editing in 2018, and as part of his Book Broker interview series, he has compiled querying advice from over 100 literary agents. As an editor, he pays special attention to structure, relationship arcs, and voice. David lives in Victoria, Canada, on the traditional territory of the Songhees and Kosapsum Nations.